Remove duplicate lines from a file

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Command/Script to remove duplicate lines from the file?

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Remove Duplicate lines from File

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Remove Duplicate Lines in File

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curlopt_proxyheader

CURLOPT_PROXYHEADER(3)					     curl_easy_setopt options					    CURLOPT_PROXYHEADER(3)

NAME

       CURLOPT_PROXYHEADER - custom HTTP headers to pass to proxy

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXYHEADER,
				 struct curl_slist *headers);

DESCRIPTION

       Pass  a	pointer to a linked list of HTTP headers to pass in your HTTP request sent to a proxy. The rules for this list is identical to the
       CURLOPT_HTTPHEADER(3) option's.

       The headers set with this option is only ever used in requests sent to a proxy - when there's also a request sent to a host.

       The first line in a request (containing the method, usually a GET or POST) is NOT a header and cannot be replaced using this  option.  Only
       the  lines  following the request-line are headers. Adding this method line in this list of headers will only cause your request to send an
       invalid header.

       Pass a NULL to this to reset back to no custom headers.

DEFAULT

       NULL

PROTOCOLS

       HTTP

EXAMPLE

       TODO

AVAILABILITY

       Added in 7.37.0

RETURN VALUE

       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

       CURLOPT_HEADEROPT(3), CURLOPT_HTTPHEADER(3),

libcurl 7.54.0							 February 03, 2016					    CURLOPT_PROXYHEADER(3)

Shell Programming and Scripting